Y years 岁月
Early y years professional experience 幼教职业经验
every y four years 每隔四年 ; 每四年
every y few years 每隔几年
All Y chromosomes in existence today are descended from a single ancestor's who is thought to have lived about 140,000 years ago.
现在存在的所有 Y 染色体都来自于一个被认为生活在大约14万年前的同一祖先。
“Natural selection is shaping the Y and keeping it vital to a degree that is really at odds with the idea of the last 50 years of a rotting Y chromosome, ” Dr. Page said.
佩奇博士说：“自然选择塑造了Y染色体，50年来，我们为Y染色体的退化争论不休，自然选择论更是加剧了这种争论。
I inform you that I have taken into partnership with Mr. Y., who has for many years acted as my manager.
我已请多年在我公司担任经理的Y .先生做为我的合伙人。特此奉告。
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